Hook



FIG. 1 is a perspective view showing the new design for a hook;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof, a right side view being a mirror image thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The portions of the hook in FIG. 3 shown in broken lines are included to show features that form no part of the claimed design. 

CLAIM The ornamental design for a hook, as shown and described. 